Set of 3 compression bags for tight packing of gear The Durin spacemaker is a durable and versatile set of bags for better protection of your kit and higher utilization of the space inside your bag. The three bags come in three different sizes all made from the same high quality, flexible polymer and equipped with a strong slider for keeping out air and water; perfect for travelling. The Durin concept is pretty simple: Put your stuff in a bag, close the bag completely with the zipper, squeeze out excess air through the valve at the bottom of the bag. Now the items are protected and space minimized.